Re: [Tutor] pickle.load() all dict
Thank you Jan. you are right . an exception whitout a reason not conducive to pragramming. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] updating python on a mac
"Karl Jansson" wrote I downloaded python 3.1.2 for the mac, and I don't know how to make it so that when I type "python" in the terminal that I get python 3.1.2 instead of 2.5.1, which came with my mac. I haven't done this personally so I can only guess but... /Applications/Python\ 3.1/Update\ Shell\ Profile.command ; exit; This script will update your shell profile when the 'bin' directory of python is not early enough of the PATH of your shell. These changes will be effective only in shell windows that you open after running this script. All right, you're a python lover already logout Did you follow these instructions? ie did you logout and then restart the shell window - ie Terminal? If so and it didn't work try running the env command Look for the PATH entry and see whether Python 2.5 comes before Python 3.1. If so you probably need to edit your ~/.profile or ~/.bashrc or ~/.cshrc depending which shell you use. HTH -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] updating python on a mac
I downloaded python 3.1.2 for the mac, and I don't know how to make it so that when I type "python" in the terminal that I get python 3.1.2 instead of 2.5.1, which came with my mac. In the instructions, it says to "update shell profile" but when I do that I get the following message, and nothing gets updated: /Applications/Python\ 3.1/Update\ Shell\ Profile.command ; exit; This script will update your shell profile when the 'bin' directory of python is not early enough of the PATH of your shell. These changes will be effective only in shell windows that you open after running this script. All right, you're a python lover already logout ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] pickle.load() all dict
Am 16.05.2010 14:45, schrieb Yutao Deng:
LOL, try...except is a good idea.
i fix it lick this:
with open("data2.pickle","rb") as file_stream:
c = 0
while True:
try:
i = cPickle.load(file_stream)
print i
c += 1
except:
print "Numer of pickled objects is %s." %c
break
#
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Just a remark on your except statement: You should not use "except:"
without specifying a concrete exception class, because all kind of
exceptions are then handled by the except block (and therefore hidden).
If for example an IOError occurs while reading the file (for what ever
reason...), it would be handled by your except block and you would never
know that there was a problem reading the file. If you use "except
EOFError:" the exception block is evaluated only when the EOFError
occurs. All other exceptions are raised as usual.
Best regards,
Jan
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Re: [Tutor] pickle.load() all dict
LOL, try...except is a good idea.
i fix it lick this:
with open("data2.pickle","rb") as file_stream:
c = 0
while True:
try:
i = cPickle.load(file_stream)
print i
c += 1
except:
print "Numer of pickled objects is %s." %c
break
#
___
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Re: [Tutor] pickle.load() all dict
Am 16.05.2010 09:10, schrieb Yutao Deng:
Hi all:
I'm trying to learn to use Python wrote a applet to record every day
doing.
and i use the pickle
pickle.dump something to file no problem i think.
but pickle.load whith a problem. can not load all dict do my way that
what i pickle.dump().
My code:
import cPickle as pickle
pickle_file = open("data2","rb")
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
console show :
{'2010-5-23': ['1242', 'first']}
{'2010-5-24': ['1232', 'third']}
{'2010-5-25': ['211', 'second']}
{'2010-3-22': ['3211', 'fou']}
{'2050-3-2': ['3990', '322']}
This is i want but that's silly. if the dict too much, then i have not
ideas.
the other way from
http://mail.python.org/pipermail/tutor/2005-July/039859.html
import cPickle as pickle
pickle_file = open("data2","rb")
number_of_pickles = pickle.load(pickle_file)
for n in range(number_of_pickles):
p = pickle.load(pickle_file)
print p
this way didnt work for me.
console show:
Traceback (most recent call last):
number_of_pickles = pickle.load(pickle_file)
cPickle.UnpicklingError: invalid load key, '
'.
how do i define a range for pickle.load a file . i mean that how can i
know how many dict in the data2.
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If you want to unpickle a file which contains an unknown number of
pickled objects, this should work. You'll get a list containing all the
objects.
#
import cPickle
import pprint
test_data_1 = {"2010-12-13": ["1324", "first"]}
test_data_2 = {"2010-12-14": ["234", "first_and_a_half"]}
test_data_3 = {"2010-12-15": ["132224", "second"]}
for data in (test_data_1, test_data_2, test_data_3):
with open("data2.pickle", "ab") as file_stream:
cPickle.dump(data, file_stream, 2)
with open("data2.pickle", "rb") as file_stream:
pickled_objects = []
while True:
try:
pickled_objects.append(cPickle.load(file_stream))
except EOFError:
break
print "Number of pickled objects is %s." % len(pickled_objects)
pprint.pprint(pickled_objects)
Cheers,
Jan
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[Tutor] pickle.load() all dict
Hi all:
I'm trying to learn to use Python wrote a applet to record every day doing.
and i use the pickle
pickle.dump something to file no problem i think.
but pickle.load whith a problem. can not load all dict do my way that what i
pickle.dump().
My code:
import cPickle as pickle
pickle_file = open("data2","rb")
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
console show :
{'2010-5-23': ['1242', 'first']}
{'2010-5-24': ['1232', 'third']}
{'2010-5-25': ['211', 'second']}
{'2010-3-22': ['3211', 'fou']}
{'2050-3-2': ['3990', '322']}
This is i want but that's silly. if the dict too much, then i have not
ideas.
the other way from
http://mail.python.org/pipermail/tutor/2005-July/039859.html
import cPickle as pickle
pickle_file = open("data2","rb")
number_of_pickles = pickle.load(pickle_file)
for n in range(number_of_pickles):
p = pickle.load(pickle_file)
print p
this way didnt work for me.
console show:
Traceback (most recent call last):
number_of_pickles = pickle.load(pickle_file)
cPickle.UnpicklingError: invalid load key, '
'.
how do i define a range for pickle.load a file . i mean that how can i know
how many dict in the data2.
___
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